[Snyk] Upgrade lit-element from 2.2.0 to 2.3.1

[snyk-bot]

Snyk has created this PR to upgrade lit-element from 2.2.0 to 2.3.1.

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• The recommended version is 4 versions ahead of your current version.
• The recommended version was released 2 months ago, on 2020-03-20.

Release notes

Package name: lit-element

• 2.3.1 - 2020-03-20
  

  Fixed

  • Add TypeScript type declarations for older versions of TypeScript. We're currently testing back to TS 3.4. We can't commit to never breaking TypeScript builds, but we'll be supporting older versions as best we can.
• 2.3.0 - 2020-03-18
  

  Changed

  • Added a static getPropertyDescriptor method to allow easier customization of property accessors. This method should return a a PropertyDescriptor to install on the property. If no descriptor is returned, no property accessor is created. (#911)
  • The value returned by render is always rendered, even if it isn't a TemplateResult. (#712)

  Added

  • Added @queryAsync(selector) decorator which returns a Promise that resolves to the result of querying for the given selector after the element's updateComplete Promise resolves (#903).
  • Added enableUpdating() to UpdatingElement to enable customizing when updating is enabled #860.
  • Added @queryAssignedNodes(slotName, flatten) decorator to enable querying assignedNodes for a given slot #860.
  • Added getStyles() to LitElement to allow hooks into style gathering for component sets #866.

  Fixed

  • Ensure UpdatingElement allows updates when properties are set after calling super.update().
    LitElement renders when updates are triggered as a result of rendering (#549).
  • Properties annotated with the eventOptions decorator will now survive property renaming optimizations when used with tsickle and Closure JS Compiler.
  • Moved style gathering from finalize to initialize to be more lazy, and create stylesheets on the first instance initializing #866.
  • Fixed behavior change for components that do not implement render() introduced in (#712) (#917)
• 2.3.0-pre.1 - 2020-03-17
• 2.2.1 - 2019-07-24
  

  Release 2.2.1

• 2.2.0 - 2019-06-11
  

  Release lit-element 2.2.0

from lit-element GitHub release notes

Commit messages

Package name: lit-element

• 772ed74 Prepare for release of v2.3.1 (Added missing proxx github repo link GoogleChrome/web.dev#937)
• aab847e Use downlevel-dts, test compile in TS 3.4 (Blog: Intrinsic Layout Getting Started GoogleChrome/web.dev#936)
• 0eda741 Prepare 2.3.0 release (Add gulp task so we can deploy styles. GoogleChrome/web.dev#933)
• 5a421e1 Fix formatting of new decorator for consistency (Make Houssein codeowner for React docs. GoogleChrome/web.dev#934)
• 61d9583 Merge pull request Lightbox type UX for images GoogleChrome/web.dev#925 from ianwith/fix-docs
• b8b9f74 Prepare 2.3.0-pre.1 release
• 38a8b85 Removes index signature from PropertyDeclaration (IGNORE prefers-color-scheme article for web.dev GoogleChrome/web.dev#929)
• 6a4c94f Fix static property for closure (Add styles. GoogleChrome/web.dev#926)
• 9060da0 Correct docs: styles - CSS inheritance
• e0dcd75 Add extra type information to help closure with type of static property. (Suggestion: Add Instruction on how to add Brotli in Apache or Nginix GoogleChrome/web.dev#923)
• 8055b93 Merge pull request #914 from Polymer/customize-properties
• 90c85a5 Address review feedback.
• 8f5815f Update comment.
• ec9048b Fix spacing.
• def6df1 Fix spacing.
• 297b8b2 Address review feedback.
• 734adc5 Adds API doc for `createPropertyDescriptor`
• 5479afa Switch back to private `_requestUpdate`
• a33f63f Adds `createPropertyDescriptor(name, key, options)`
• b96a366 Improved type.
• 8084b9f Fix compilation with TypeScript 3.8, which updated custom element types. (Fixed typo GoogleChrome/web.dev#902)
• 0df1580 Only call lit-html render if LitElement subclass implements render (Fast: Codelab for critical CSS GoogleChrome/web.dev#917)
• d0ecc90 Expands property customization test
• e2ef7d9 Lint fix.

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